Knife block



FIG. 1 is a top view of a knife block.

FIG. 2 is a front view of the knife block.

FIG. 3 is a right view of the knife block.

FIG. 4 is a back view of the knife block.

FIG. 5 is a bottom view of the knife block; and,

FIG. 6 is a left side perspective view of the knife block.

The broken lines in the figures are for environmental purpose only and form no part of the claimed design. 

The ornamental design for a knife block, as shown and described. 